Trump critics believe that, in addition to meeting a moral imperative, the inquiry will put the president under the most intense spotlight yet, exposing misdeeds and crushing his reelection hopes.

But the danger is that the pro-impeachment ardor among Democrats and progressives could remain unreciprocated among the broader electorate.

Pelosi has long been skeptical of the politics of impeaching Trump. The issue has never polled well among the general public, and she has repeatedly pumped the brakes when other Democratic members wanted to charge ahead.

In a formal announcement delivered at 5 p.m. on Tuesday, Pelosi used the word “betrayal” three times about Trump.

His actions, she said, amounted to “betrayal of his oath of office, betrayal of our national security and betrayal of the integrity of our elections.”

Trump has appeared to acknowledge discussing Biden on a July 25 phone call with Ukrainian President Volodymyr Zelensky but denies any quid pro quo offer.

However, the leaders’ conversation took place while the administration was withholding almost $400 million in aid that Congress had voted to supply to the Eastern European nation.

Those events appear to be central to an official complaint made against the president by an unnamed whistleblower.

The complaint was deemed credible and urgent by the inspector general for the intelligence community, but the administration has so far thwarted attempts to provide the complaint to Congress, sparking Democratic ire.

“This case is much more transparent. People can understand that the president of the United States should not be using the power of his office to get foreign governments to interfere in American elections,” Devine said.

“Everybody can see it and get it. You don’t need to read 500 pages.”

Had Pelosi sought to hold back the tide much longer, she would have risked alienating some of her own members and potentially deflating Democratic voters heading into 2020.

In recent days, progressives — and several 2020 Democratic presidential candidates — had adopted a new, more aggressive tone, suggesting it would be an abdication of responsibility to hold off any longer.

Both candidates had previously called for Trump’s impeachment but emphasized the urgency in this week’s statements.

The goal for Pelosi and the Democrats will be to make the case for Trump’s impeachment beyond the ranks of those who already believe in it.

The details of the Ukrainian story have emerged too recently for there to be reliable polling on the issue. But when impeachment has previously surfaced as a possibility — most obviously in the wake of the Mueller report — it has been broadly unpopular.

A Quinnipiac University poll in late July, for example, indicated 60 percent of registered voters were opposed to beginning impeachment proceedings, while only 32 percent were in favor.

That was almost the exact inverse of the view among Democratic voters, 61 percent of whom favored beginning impeachment proceedings and 29 percent of whom were opposed.

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The fear among Pelosi and her allies has long been that the liberal grassroots are overestimating the public’s appetite for impeachment, that such an effort could take the political focus away from issues such as health care that were effective in Democrats’ victories in the 2018 midterms, and that Trump and his loyalists in the political and media worlds will try to jiujitsu the issue to his advantage.

The pro-Trump counterattack had already begun on Tuesday, with the president telling reporters that he believed a Democratic-led push for impeachment would be “a positive” for him “in the election.”

His campaign sent out a fundraising email inviting “patriots” to contribute to the “Official Impeachment Defense Task Force.”